chore: reorganize para current/, rails 8.1, testes e readme

- move app para current/ (estrutura capistrano)
- rails 7.2 → 8.1, ruby 3.2, sqlite3 2.x
- adiciona primary_key Idinformativo no model
- schema.rb completo com todas as tabelas
- testes minitest: models (Tag, Informativo, Tema) e controllers
- readme atualizado em pt-br com stack e instruções de desenvolvimento
- gitignore exclui dump.sql, *.duckdb e sqlite3

current/app/assets/javascripts/active_admin.js

@@ -0,0 +1,3 @@
+//= require trix
+//= require active_admin/base
+//= require activeadmin_addons/all

current/app/assets/javascripts/admin/active_admin.js

@@ -0,0 +1 @@
+//= require active_admin/base

current/app/assets/javascripts/application.js

@@ -0,0 +1,17 @@
+// This is a manifest file that'll be compiled into application.js, which will include all the files
+// listed below.
+//
+// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, or any plugin's
+// vendor/assets/javascripts directory can be referenced here using a relative path.
+//
+// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
+// compiled file. JavaScript code in this file should be added after the last require_* statement.
+//
+// Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
+// about supported directives.
+//
+//= require jquery-3.4.0.min
+
+$(document).ready(function(){
+  console.log("- by http://extrapolo.com -")
+});